Why is work done in constant acceleration zero?

Is is possible to have a velocity without also having a concurrent acceleration (relatively speaking.) Acceleration measures change in velocity over time. Measuring a change over time is a very common task in Physics. read more

The work done in constant acceleration is not zero. W= F*d. we have force due to the acceleration, the object is moving so we definitely need to do some work on the object. But we can say that power is added to the object when in constant acceleration. Due to the acceleration the distance covered by the object in successive time interval increases. read more

Almost. It is possible that you have a nonzero acceleration which is perpendicular to the velocity, and in that case, the direction of the velocity is changing but its magnitude stays constant. The net work done would be zero, because work is related to the change in speed (i.e. magnitude of velocity). read more

Per the work-energy theorem, the net work done on the piece of chalk is thus zero. Compare that to the situation where the piece of chalk is still being lifted upwards. The initial kinetic energy is still zero, but the kinetic energy at the point in time of interest (chalk moving upward) is non-zero. read more

So, comparing the amount of work done while the bricks move with constant speed, there is no difference. However, there is a difference in the power since power is the rate at which work is done. If the same amount of work is done in half the time, the associated power is double. read more